Nanostructured p-type Cr/V<inf>2</inf>O<inf>5</inf> thin films with boosted thermoelectric properties

Joana Loureiro, Joao R. Santos, Adriana Nogueira, Frederic Wyczisk, Laurent Divay, Sebastian Reparaz, Francesc Alzina, Clivia M. Sotomayor Torres, John Cuffe, Fatima Montemor, Rodrigo Martins, Isabel Ferreira

    Research output: Contribution to journalArticleResearchpeer-review

    18 Citations (Scopus)

    Abstract

    The urgent need for non-toxic and abundant thermoelectric materials has become a significant motivation to improve the figures of merit of metal oxides in order to remove the barrier towards their widespread use for thermoelectric applications. Here we show the influence of a Cr layer in boosting the thermoelectric properties of vanadium pentoxide (V2O5) thin films, deposited by thermal evaporation and annealed at 500 °C. The Cr to V2O5 thickness ratio controls the morphological and thermoelectric properties of the thin films produced. The optimized Seebeck coefficient and power factor values at room temperature are +50 μV K -1 and 7.9 × 10-4 W m-1 K-2, respectively. The nanograin structure of the films is responsible for an improvement in the electrical conductivity up to 3 × 105 (Ω m)-1 with a typical thermal conductivity of 1.5 W m -1 K-1. These results combine to yield promising p-type thermoeletric CrV2O5 thin films with a ZT of 0.16 at room temperature. This journal is © the Partner Organisations 2014.
    Original languageEnglish
    Pages (from-to)6456-6462
    JournalJournal of Materials Chemistry A
    Volume2
    Issue number18
    DOIs
    Publication statusPublished - 14 May 2014

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